Drought tolerance related to root morphology and stomatal structure of the 12 seasonal rice varieties (Oryza sativa L.) under artificial drought conditions

Abstract

Drought-tolerant rice varieties are one of the best choices to avoid the effects of drought. A Randomized Complete Block Design (RCBD) with three replications was used for the experiment. 12 seasonal rice were tested under artificial drought conditions. The criteria were assessed through the morphology, root anatomical structure, and stomatal leaves that were suitable for the drought environment. The results showed that 3 seasonal rice were well adapted to this condition.Sophinh had the smallest density and area of stomata (529.3 stomata/mm2 and 88.6 μm2 respectively), they helped reduce water loss. Xuong ga do had the highest ratio of deep roots 58.7% which could increase the ability to take water from the deep soil layer. Bang nau had a thick root diameter of 876.3 μm and a stele root area of 54.4x103 μm2 containing a high number and more areas of late metaxylems (5.6 and 12x103 μm2 respectively). These factors helped increase water flux from root to shoot. Correlation among the density of stomata, number of roots, and the number of late metaxylem were negative while correlation among diameter of roots, number of late metaxylem, and total areas of late metaxylem were positive. These results were useful for developing drought-tolerant rice varieties.

Arbuscular Mycorrhiza Fungi Enhance the Growth, Yield, and Quality of Medicinal Mondo Grass (<i>Ophiopogon japonicus</i> (L.F.) Ker – Gawl.) under Rainfed Conditions

“…Under water-shortage conditions, plants adjust the osmotic by accumulating the solutes in cells to increase cytosol osmotic pressure which stimulates more water absorption (Tran and Nguyen, 2011) The average SPAD value of G1 was 38.4 significantly higher than G2 (35.3). Applying AMF increased SPAD with the highest value at M4 on both genotypes of 41.0 and 37.0, respectively.…”